Momentum is a vector. Mass is barely a scalar. So in case you have mass yet 0 velocity, then there is no direction that could be defined for the momentum. There may well be another combinations that could desire to yield a momentum, inspite of the undeniable fact that it has to contain a vector. EDIT: confident, the flair of rolling is there, inspite of the undeniable fact that it is not rolling. What if fairly of a tether, a tiny rock is obstructing it. Does that fluctuate the situation? What direction is the momentum then? What if the rock is greater advantageous? the certainty that it may desire to roll downhill is a mix of close by geometry and gravitational fields. at the same time those combine to form forces and skill potential, no longer momentum. Momentum is a particular conserved quantity. Are there any interactions you may describe via which this manner of "momentum" could properly be transferred to a various merchandise?